Be sure you save your actual tax file to a flash drive before you delete anything. Search for "*.tax20XX" (substitute the two-digit year for XX). You'll need it next year.
Using a Windows computer, you should be able to uninstall TurboTax Desktop from the Start Menu >> All Apps. Find TurboTax 20XX, right click and choose "Uninstall."
To confirm all files have been removed, go to C:\Program Files\TurboTax and looks for a folder for Individual 20XX. If you find that folder, delete it.
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